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Portable ventilator system

  • US 8,683,997 B2
  • Filed: 10/31/2007
  • Issued: 04/01/2014
  • Est. Priority Date: 08/04/2003
  • Status: Active Grant
First Claim
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1. A portable ventilator comprising:

  • a blower unit outputting compressed gas and including interlocking helical lobed impellers counter-rotatable within a blower housing in variable speed mode;

    a speed servo configured to change a speed of the interlocking helical lobed impellers of the blower unit to accelerate and decelerate the blower unit to provide ventilation; and

    an exhalation servo control system configured to provide a desired positive end expiratory pressure from the output of said blower unit.

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